976 TRIFOLIUM. | CLASS XVII. ORDER 11. 
always erect, ciliated, the mouth closed with a cartilaginous ring. 
Corolla scarcely longer than the calyx, pale rose colour. Legume 
membranous, containing two seeds, but only perfecting one. 
Habitat.—Dry fields and pastures ; frequent. 
Annual; flowering in June. 
2. Trirotiastrum. De Cand. Prod 2. p. 198. Flowers ma 
rounded head, or spike, sessile, or pedunculated. Calyx mouth 
naked. Corolla after flowering persistent, the vexillum striated. 
9. T. suffoca'tum, Linn. (Fig. 1130.) Suffocated Trefoil. Heads 
sessile, sub-globose, axillary, of numerous sessile densely crowded 
smooth flowers; calyx membranous, its mouth naked, the teeth 
lanceolate, acute, unequal, spreading’; leaflets obcordate, acutely 
serrated; stipules ovate, acute, membranous ; stem prostrate; legume 
two seeded. 
English Botany, t. 1049.—English Flora, vol. iii. p. 299.—Hooker, 
British Flora, ed. 4. vol. i. p. 276.—Lindley, Synopsis, p. 79. 
foot slender, tapering. Stems prostrate, mostly several, round, 
smovth, leafy, mostly buried under the ground. Leaves on long 
slender footstalks, leaflets obcordate, smooth, acutely toothed towards 
the apex. Stipules large, ovate, acute, membranous, and striated. 
Inflorescence sessile globose axillary heads of numerous smooth 
crowded erect flowers, having an involucre enveloping the base. 
Calyx membranous, sub-cylindrical, slightly striated, and sometimes 
scattered over with a few slender hairs, the teeth unequal, lanceolate, 
acute, spreading, its mouth open. Corolla small, inconspicuous. 
Legume oblong, two seeded. 
Habitat—Sandy sea shores, rare; coasts of Norfolk, Suffolk, near 
Hastings, Anglesea. 
Annual; flowering in June and July. 
10. Z. glomera'tum, Linn. (Fig. 1131.) Smooth round-headed 
Trefoil. Smooth, heads globose, axillary, sessile, of numerous 
crowded sessile smooth flowers; calyx cylindrical, ten ribbed and 
furrowed, the teeth ovate, acute, becoming leafy, veiny, and reflexed ; 
leaflets oblong, acutely toothed and veiny; stipules membranous, 
lanceolate, taper pointed ; stem procumbent; legume two seeded. 
English Botany, t. 1063.—English Flora, vol. iii. p. 307—Hooker, 
British Flora, ed. 4. vol. i. p 276—Lindley, Synopsis, p. 81. 
Root tapering, branched. Stem prostrate, smooth, round, or some 
what angular, more or less branched and leafy, from four to twelve 
inches long. Leaves with long slender footstalks, leaflets of the lower 
leaves obcordate, of the upper oblong, all smooth, with the mid-rib 
and lateral veins prominent, acutely toothed. Stipules pale, thin, 
and membranous, striated with veins, lanceolate, taper pointed. 
Inflorescence axillary. globose heads of numerous smooth sessile 
flowers. Calyaw cylindrical, ten ribbed, and furrowed, smooth, the 
